Anisotropic magnetic and transport properties have been investigated for single crystals of (Nd 1- z La z )Sr 2 Mn 2 O 7 . We have derived the magnetic phase diagram against the La concentration z and have found that the low-temperature state is of layered antiferromagnetic with alternating MnO 2 -sheets. The reentrant-type charge-ordered state is observed in the limited z -region around z =1.0 due to the released Jahn-Teller distortion. We further investigated magnetotransport properties for these antiferromagnetic manganites, and have found a large negative magnetoresistance, e.g. , ρ c ( H )/ρ c (0)∼0.86 and ρ ab ( H )/ρ ab (0)∼0.88 at µ 0 H =1 T.
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Moritomo et al. (1999) studied this question.
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